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CH. Earth,moon, and
sun lesson 1-6
| Word | Definition |
|---|---|
| satellite | an object that orbits a planet |
| planet | an object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit |
| meteor | a streak of light in the sky produced by the burning of a meteoroid in earths atmosphere |
| comet | a loose collection of ice and dust that orbits the sun typically a long narrow orbit |
| star | a ball of hot gas primarily hydrogen and helium that undergoes nuclear fusion |
| constellation | a pattern or grouping of stars |
| axis | an imaginary line that passes through a planets center about which the planet rotates |
| rotation | the spinning motion of a planet on its axis |
| revolution | the movement of an object around another object |
| orbit | the path an object takes as it revolves sround another object in space |
| calendar | a system of organizing time that defines the beginning |
| solstice | either of the two days of the year on which the sun reaches its greatest distance north or south from the equator |
| equinox | either of the days of the year on which neither hemisphere is tilted toward or away from the sun |
| force | a push or pull exerted on an object |
| gravity | the attractive force between objects |
| law of universal gravitation | the scientific law that states that every object in the universe attracts every other object |
| mass | the amount of matter in an object |
| weight | a measure of the force of gravity on an object |
| inertia | the tendency of an object to resist a change in motion |
| newtons first law of motion | The scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force |
| phase | one of the different shapes of the moon as seen from earth |
| eclipse | a partial or total blocking of one object by another |
| solar eclipse | the blocking of sunlight to earth that occurs when the moon is directly between the earth and the sun |
| umbra | the darkest part of a shadow |
| penumbra | the part of a shadow surrounding the darkest part |
| lunar eclipse | the blocking of sunlight to the moon when earth is between the sun and the moon |
| tide | the periodic rise and fall of the water level in the ocean |
| spring tide | the tide with the greatest difference between consecutive high and low tides |
| neap tide | the tide with the least difference between consecutive high and low tides |
| maria | Dark, flat areas on the moons surface formed from huge ancient lava flows. |
| crater | a large round pit caused by the impact of a meteroid |
| meteroid | a chunk of rock or dust in space, generally smaller than an asteroid |
Created by:
abelan001
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